Former Mayor of New York City Rudy Giuliani (C) speaks with Chris Christie, former New Jersey governor, during ceremonies marking the 17th anniversary of the September 11, 2001 attacks on the World Trade Center, at the National 9/11 Memorial and Museum in New York, U.S., September 11, 2018. U.S. Ambassador to the United Nations Nikki Haley (L) is also pictured.  REUTERS/Brendan McDermid
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